C’mon. Mig-31 is a one nice aircraft. It is believed to be a reason for SR-71 retirement at the time.
Come ON .... what’s the survival rate for Russian made junk up against USA aircraft and tanks?
SR-71 retired because it was no longer needed as satellites were able to do a better job for lower cost.
No one except civilians are fearful of Russian made arms (because that is exactly what their design and purpose is). As said, they do not stand the test of real combat against a peer.